Goldies are always hungry! If they stop eating I'd be a little worried, usually means something is wrong. In your case, this might just be the shock of moving, or different temp, or water composition. I'd check the pH, NH3
just in case.
Also, if your water is really cold (like in the 50's), they will stop eating. They do that in ponds come winter, kinda goes into hibernation.
As to irresistable food, try chopped cocktail (or other cooked) shrimp. Mine also go nuts over peas (cooked, skin removed, chopped).